FOXBORO — Patriots head coach Jerod Mayo, offensive coordinator Alex Van Pelt and assistant quarterbacks coach Evan Rothstein huddled at midfield during the final minutes of Tuesday’s practice.

Given the performance they had just witnessed, it’s hard to imagine they were simply chit-chatting.

Drake Maye had just taken three would-be sacks in four plays, killing his two-minute drill. Jacoby Brissett took two “sacks” in his two-minute drill, which stalled late. In all, Patriots quarterbacks were “sacked” 11 times on 44 dropbacks, a full quarter of the time in their joint session with the Eagles.

The Pats could hardly run the ball. And they suffered from three false starts, a bad snap and separate procedural penalty.

According to Mayo, success this season is about “laying the foundation.” Offensively, his foundation right now is a leaky mess.

The Eagles proved it. Because of the dozens of snaps the Patriots’ starters took against a legit contender, Tuesday’s practice was the team’s most telling of the summer. The story it told was that of an offense that’s facing serious — and all-too-familiar — problems in pass protection.

Now, the Pats did have their moments: Maye connected deep with fellow rookies Javon Baker and Ja’Lynn Polk early on, including one 7-on-7 drill. DeMario Douglas finished with four-plus catches for a third straight day. Brissett hit a couple throws under pressure and on the move.

But the offensive line’s performance ensured those were only flashes instead of building blocks for steady, successful drives. Through three weeks of camp, it’s clear sustained success will be impossible until the Patriots can block. Right now, they have four proven, starting-caliber linemen and have less than a month to develop a fifth.

Time will tell with this O-line, just as it did taking a snapshot on Tuesday.

Elsewhere at practice, the Patriots’ defense stood up to an explosive Eagles attack, a rising edge rusher collected multiple sacks, the kickoff team had an unexpected star, Christian Gonzalez went head-to-head with A.J. Brown and Christian Barmore popped by for the first time since he was diagnosed with blood clots.

Here are Tuesday’s complete practice observations, with contributions from the Herald’s Doug Kyed and Zack Cox.

Absent: DL Christian Barmore, TE Hunter Henry, S/LB Marte Mapu

Non-participants: DB Jonathan Jones, DB Marcus Jones, CB Shaun Wade

Limited: C David Andrews

PUP: WR Kendrick Bourne, LB Sione Takitaki, OL Cole Strange

Notes: Both Joneses appeared in full pads for warmups, then left with Wade. Marcus Jones hasn’t practiced in 12 days, and Jonathan Jones has now been out a full week. Henry missed his second consecutive full practice, though Mayo said he does not expect him to be out long-term.

Andrews yielded some of his first-team snaps to new backup center Nick Leverett in team periods.

Drake Maye hits Javon Baker deep

After practice, Maye said he’s been targeting Baker deep because he’s made plays on those type of routes. Well, Baker made another on Tuesday.

After gaining a step on Eagles cornerback Avonte Maddox down the right sideline, Baker tracked a deep, on-target Maye throw and caught it over his right shoulder, before sliding for what would have been a 30-yard gain in 7-on-7s. It was one of the longest completions Maye’s had all of camp, and potentially a promising sign for his growing chemistry with the fourth-round rookie.

OLB Oshane Ximines

This is no preseason flash in the pan.

Ximines repped with the Patriots’ top defense for stretches of 11-on-11s, tallying 1.5 sacks and a drawn holding penalty on the day. Last week, he made waves in the team’s preseason opener and continues to apply pressure in practice. On Tuesday, facing the best offensive line he’s seen all summer, Ximines starred again.

Note: The passing stats below were tallied during competitive 7-on-7 and 11-on-11 periods only. The stats in parentheses represent the quarterbacks’ camp-long performance.

Jacoby Brissett: 18-of-30, 2 INTs, 4 sacks (137-of-208 — 66.8%, 6 INTs, 21 sacks)

Drake Maye: 12-of-18, 6 sacks (114-of-190 — 60%, 5 INTs, 18 sacks)

Notes: Maye started a perfect 9-of-9, finding six different receivers in a 7-on-7 drill, then Ja’Lynn Polk twice and Douglas twice underneath in a full-team drill. He played with a rhythm and decisiveness that had been spotty in recent days, then got buried by Philadelphia’s pass rush. For a full accounting of Maye’s day, read the Herald’s separate story on his performance Tuesday.

As for Brissett, who took all of the snaps behind the Patriots’ starting offensive line, he opened 10-of-11 over three team periods. He took one sack, with Eagles defensive end Brandon Graham beating Chukwuma Okorafor. And slowly, it all fell apart from there.

During an 11-on-11 tight ed-zone period, Brissett went 1-for-2 with a Rhamondre Stevenson checkdown and defensive pass interference penalty that negated an incompletion for Austin Hooper down the seam. His last throw was a perfect back-shoulder toss back to Hooper, who lost the ball as he went to the ground and handed an interception to Eagles linebacker Zack Baun.

Drake Maye, Patriots offense starts hot in joint practice with Eagles before O-line crumbles

In the next red-zone drill, Brissett hit one of two passes intended for Hooper and threw a near pick that Jalen Reagor broke up in a crowd of Eagles. With two 11-on-11 periods left, he took back-to-back sacks after a short completion to back-up tight end Mitchell Wilcox, fired incomplete for Tyquan Thornton who couldn't unstick from Darius Slay's tight coverage on a hitch route, then a dig, overshot Hooper deep and tossed an interception to backup linebacker Jeremiah Trotter Jr. while looking for K.J. Osborn.

The play-by-play of his two-minute drill was as follows: Hooper short catch, incompletion to Hooper, Douglas catch over the middle, sack, Reagor catch amid double coverage, an Eagles penalty for too many men on the field, Douglas short catch, incompletions to Hooper, Reagor and Osborn, then a sack.

WR DeMario Douglas

It doesn't matter if he's facing his own defense or another, Douglas doesn't stop popping. He caught all five targets in team periods, trailing only tight end Austin Hooper (six on 12 targets). Douglas is sure-handed and almost always open.

DT Daniel Ekuale

The Patriots' replacement for Christian Barmore looked like his stunt double for one practice, recording multiple run stuffs and pressures. More on Ekuale later.

S Jabrill Peppers

Peppers was a force from start to finish. He crashed the line, thwarted multiple run plays, tallied a half-sack and chirped a talented Eagles offense throughout.

CB Marco Wilson

The fourth-year corner allowed six catches during team drills, worst among all Patriots defensive backs. He also got whistled for a hold in 1-on-1s and allowed a catch on his other rep.

OL Atonio Mafi

Mafi got smoked in 1-on-1 pass rush and had another bad snap with Maye. The Patriots may have found a backup center, converting career guard Nick Leverett, but they do not have a No. 3 option.

OT Calvin Anderson

Anderson went 0-3 in individual pass rush drills, allowed a "sack" of Maye on his first dropback of 11-on-11s and played left tackle on the line that allowed Maye to get sacked three times at the end.

Patriots rookie receivers Ja’Lynn Polk, Javon Baker shine in Eagles joint practice