COLUMBUS, Ohio — Another game can be added to that ever-unpleasant list of defeats that stand between the Islanders and playoff security. 

Two losses to Arizona, two losses to Nashville, losses in Montreal and Philadelphia and at home to the Blues, and now a regrettable 5-4 overtime loss to Blue Jackets.

On Friday night came the latest, as Boone Jenner scored on a power play just 40 seconds into the extra period. 

The loss to Columbus, which sits at the bottom of the Metropolitan Division, came on the front end of a back-to-back for the Islanders, who had a turnaround of just 22 hours before a Saturday date against the Sabres. 

One bad night doesn’t undo a month of good work by the Islanders, especially given that they got the loser point.

But the second point slipped through their fingers, make no mistake about it. 

“It’s a huge point for us,” Adam Pelech told The Post, “but I think we ought to be better from the puck drop.” 

A third-period push was enough to avoid disaster, but wasn’t enough to hand the Islanders a victory. 

Goals from Kyle Palmieri and Brock Nelson within the first eight minutes of the third period tied the score at 4-4, but a poor first 40 minutes came back to haunt the Islanders.

Jenner notched the overtime winner for Columbus at four-on-three, tipping Adam Boqvist’s shot in after Anders Lee’s high-sticking penalty carried into the extra period. 

For too much of this match, the Islanders seemed to expect a Blue Jackets squad decimated by injuries to just roll out of the way.

After a run of games that looked like dress rehearsals for the playoffs, this one looked more like it came out of mid-November. 

“It took us too long to get to our game,” coach Lane Lambert said. 

That paid all the wrong kinds of dividends during a messy second period, in which Columbus turned around a 1-0 deficit and took a 4-2 lead into the third. 

Johnny Gaudreau tied the score at 1-1 with a low-left circle wrist shot 4:58 into the second, and even though the Islanders retook the lead just 32 seconds later on Nelson’s one-timer, that did not last long. 

Liam Foudy scored from Jack Roslovic at 8:59, beating Noah Dobson in the crease to do so.

Then at 17:06, Kent Johnson — a Michigan grad — scored a Michigan goal on Ilya Sorokin on the 27th anniversary of Mike Legg’s original lacrosse-style score for the Wolverines in the NCAA Tournament.

Johnson lifted the puck into the upper-left-hand corner of the net and electrified Nationwide Arena.

Forty seconds later, as the Islanders were still regrouping, Eric Robinson scored to put Columbus up 4-2. 

“A lot of it’s closing quickly in the D-zone, eliminating plays, because they are a skilled team,” Pelech said. “Once they get rolling and stuff, you can see they make plays.” 

Palmieri’s and Nelson’s third-period goals nearly rendered that meaningless, but even against a struggling team, a three-goal comeback in the last 20 minutes, as it turns out, is a heavy lift. 

The Islanders had scored first, though that came amid a yawning first period in which they leaned on Sorokin more than they might have liked.

A bouncing wrist shot from Zach Parise trickled through Columbus goaltender Michael Hutchinson 13:37 into the match for the 1-0 lead. 

It was Parise’s 20th goal of the season, a vindicating milestone for a 38-year-old who was cast off by the Wild two years ago and a mark that made the Parises — Zach and his father, J.P. — the fourth father-son duo to put up 20 goals apiece in a season for the same franchise.

J.P. Parise did it for the Islanderss twice between 1975 and 1977. Zach Parise is also the first Islander age 38 or older to reach 20 goals. 

On a night that ended with two points, that would have surely been a factoid worth celebrating for the Islanders.

Instead, it was a footnote to defeat. 

“Where we were going into the third period, it’s a good point,” Parise said. “[But] I think we left it on the table. Put ourselves in that position, not ideal.” 

One loss, even to a team with a 23-41-7 record, is not a calamity.

But the Islanders’ margin for error is not so wide as to be able to withstand anything resembling a losing streak.

Not with nine games left in the season and four points between them and the Panthers, who are below the playoff cutline but with a game in hand. 

“We were gonna try to salvage a point,” Palmieri said. “Thought we maybe left another one on the table there.”