Back in the spring, and especially in the summer, movement along the offensive line was omnipresent.

The constant was at left tackle, where Andrew Thomas is a fixture, and at right tackle, where the Giants hope Evan Neal can be viewed in that regard one day.

The interior of the line was a mix-and-match affair, and it was clear the coaching staff was looking for the best three players to fill those three spots — and that there was no early consensus who those best three players were.

“We prepare for a lot of different scenarios week in and week out, we prepare for a lot of personnel issues that may arise,’’ offensive line coach Bobby Johnson said recently. “We can’t wait until they happen.

“We’ve got to prepare for a lot of things, so I do different things every week, maybe things people don’t expect. There’s things we talk about as a coaching staff we talk about — ‘Hey, what if this happens?’ — did you at least coach it?’’

Three games in, this has happened, and that has happened and a whole bunch of different scenarios left the offensive line — a source of such consternation for too long — once more in a state of flux as the Giants get the weekend off following their rush-job (three games in 12 days) opening to their season.

In Thursday night’s 30-12 loss to the 49ers, just two of the five O-linemen who started in Week 1 were on the field.

Neal has started all three games at right tackle — the results thus far are worrisome — and rookie John Michael Schmitz has started all three games at center, with predictable first-year ups and downs.

Thomas missed the past two games with a strained hamstring.

It figured that his replacement would be Matt Peart, as he made the roster as the swing tackle, presumably for this exact situation — step in if one of the tackles got hurt.

Peart, though, was bypassed for Josh Ezeudu, who received most of his work at guard, a second-year player the front office believed would win the starting left guard spot in training camp.

That did not happen. He failed to beat out steady Ben Bredeson, who made the Week 1 start at left guard against the Cowboys.

The right guard spot was supposed to be stable, after Mark Glowinski started 16 games there in 2022.

Glowinski, unexpectedly, had to fend off competition over the summer to retain the starting job and, after a poor performance in the opener, was outright benched.

That the decision was made to sit Glowinski and replace him with Marcus McKethan — with two NFL snaps on his résumé after missing his rookie year with a torn ACL — was a bit of a shocker.

Glowinski was not off the field for long, though, as Bredeson was forced out against the Cardinals in Week 2 with a concussion and Glowinski finished up at left guard.

With Bredeson in the protocol, it figured that Glowinski would stay in the lineup four days later at San Francisco.

Nope. Glowinski was benched, again, in favor of Shane Lemieux.

No one saw that coming, as Lemieux, beset by injuries, appeared in just two games the past two seasons.

Has the line steadied the course during all this turbulence? Hardly.

Daniel Jones in three games has been sacked 12 times, and the Giants are 29th in the league in scoring average (14.3 points a game), 27th in passing yards (165.3) and tied for 24th in rushing yards (88.0).

This has come against the Cowboys and 49ers, two of the best defensive fronts in the NFL.

In 118 snaps covering the two games, McKethan allowed one sack and six total pressures, according to Pro Football Focus.

Ezeudu in 132 snaps gave up one sack and five pressures. Lemieux, clearly rusty, allowed one sack — he was bull-rushed by Javon Hargrave — and five pressures but his run-blocking was solid, as he helped open a space for Matt Breida on an 8-yard touchdown run.

“That’s a tough front man,’’ Lemieux told The Post after the game. “I’m not going to be happy unless we get the win. Felt good to be back out there, it’s been a while. It definitely was a challenging front, got to play better.’’

When Thomas returns — he should be ready for the Oct. 2 “Monday Night Football’’ meeting with the Seahawks — perhaps Ezeudu moves in at right guard and Bredeson returns to left guard.

That would subscribe to the “get on the field who we think are the five best players, regardless of position’’ approach.

“I have a lot of confidence in a lot of things we work on,’’ Johnson said. “The only way you’re going to find out if a guy’s ready is if he has to do it.’’

Through three games, too much has had to be done along the offensive line.

Most of it still needs work.