MIAMI — The thing that will haunt the Knicks all summer long, barring some kind of profound turnaround, will not be the Heat’s 3-point shooting, even if there are stretches of these games when it seems they won’t ever miss again.

It won’t even be Jimmy Butler and Bam Adebayo, as good as they are, as good as they were, as well as they’ve played, the two of them combining for 50 points Monday, with Butler adding 10 assists and Adebayo 13 rebounds, powering the Heat to the brink of the Eastern Conference finals with this 108-101 victory.

No. This is what will irk them, preoccupy them, keep them up at night in July and August and all the way to training camp, thinking back at this series:

They have been outworked.

They have been outhustled.

They have played the regular stooge to Miami’s smarter, savvier, crisper approach.

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Josh Hart joined teammate Julius Randle in criticizing the officiating:

Jalen Brunson spoke about what needs to change as the Knicks now look to stave off elimination going back home:

Julius Randle was not happy with the officiating in Game 4.

He fouled out midway during the fourth quarter.

And here's what Julius Randle had to say about the team's rebounding struggles when asked by The Post's Peter Botte:

The Knicks were out-rebounded 44-35 by the Heat, including surrendering a few critical offensive rebounds to kill any hopes of a comeback in the fourth quarter.

Here's what Tom Thibodeau had to say about the rebounding struggles:

MIAMI — Quentin Grimes’ return to the starting lineup came with mixed results. 

He hit as many 3-pointers Monday night (three) as he had all postseason, but it didn’t help the Knicks avoid falling into a 3-1 hole in this Eastern Conference semifinal series. 

Coach Tom Thibodeau reinserted Grimes into the starting lineup after bringing him off the bench for the first three games of the series.

It didn’t change the result, as the Knicks fell to the Heat, 109-101, at Kaseya Center and will face elimination Wednesday night at the Garden. 

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History is not exactly on the Knicks' side.

They've never come back to win a series after trailing 3-1, while the Heat have never lost a series after being up 3-1.

After dominating the Cavaliers on the glass, the Knicks have struggled in the rebounding department against the Cavaliers.

The Knicks were out-rebounded 44-35 by the Heat, and Miami used multiple offensive rebounds to kill the game off in the fourth quarter.

Bam Adebayo led the way for the Heat with 13 rebounds.

The Knicks' bench, which had been a strength for much of the season and the beginning of the playoffs, came up empty again.

The unit was outscored 32-10 by the Heat's bench.

It's been a glaring problem for the Knicks against the Heat.

MIAMI – The Knicks knew they had to play harder, shoot straighter and defend tighter than they had in their woeful previous game against the Heat to have a chance to even up the Eastern Conference semifinals.

Even making those improvements weren’t enough for the Knicks to pull out their most pivotal game of the season, however, pushing them into a 3-1 series hole and to the brink of elimination following a 109-101 loss Monday in Game 4 at Kaseya Center.

Tom Thibodeau’s team will get its first chance to extend the season Wednesday night at the Garden.

Jimmy Butler fronted the Heat again with 27 points and 10 assists, while All-Star center Bam Adebayo enjoyed another dominant game inside against Mitchell Robinson and Isaiah Hartenstein, finishing with 23 points and a game-high 12 rebounds.

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The Knicks will return back home staring at a 3-1 series deficit.

They fell to the Heat 109-101 in Game 4.

Jalen Brunson led all scorers with 32 points, while RJ Barrett added 24 for the Knicks.

Jimmy Butler led the Heat with 27 points while Bam Adebayo added 23.

Game 5 is on Wednesday at Madison Square Garden.