Let's keep it for now.

I agree it's very new and that it's maybe not absolutely clear it's an established expression yet, but I would instead prefer to keep it for now and revisit later to see if it's still used (and delete it if it's not) because our users might very well come across it right now and want to look it up. Seems like a waste.to not allow them to find this entry now that we've made it.

https://www.weblio.jp/content/片親パン
https://sirabee.com/2023/01/10/20163005619/
「母子家庭・父子家庭の子供がいつも与えられていそうな安価で量が多いパン」を意味する。具体的には複数個入ったあんパン、クリームパン、チョコチップスナックパン商品などを指し

This is how I'd gloss it.
But I'm not really convinced this is an established term. It only appeared in a few dozen tweets in 2022.　The recent tweets and coverage in articles and on まとめ sites over the past couple of weeks appear to stem from this one tweet that went viral on 5th January: https://twitter.com/pacotuma/status/1610838468556652545. The oldest tweet that contains 片親パン is from October 2021.
The term has provoked a lot of outrage but there's little evidence it's commonly used.
I think it's too early at this stage to determine whether it's worth adding. I suggest deleting it and coming back to it in a year or two.

@@ -14 +14 @@
-<gloss>cheap, sweet bread stereotypically eaten as a meal in single-parent households</gloss>
+<gloss>cheap, sweet bread rolls sold in multipacks (stereotypically eaten by children in low-income single-parent households)</gloss>

sweat -> sweet

@@ -14 +14 @@
-<gloss>cheap, sweat bread stereotypically eaten as a meal in single-parent households</gloss>
+<gloss>cheap, sweet bread stereotypically eaten as a meal in single-parent households</gloss>