WIPocket

Honestly, no. Whenever I see late notifications its usually on a degoogled phone, so this was just my first guess. Good luck!

In that case, is Google Play Services allowed to run in the background / unrestricted / whatever? It is the means to delivering notifications for most apps.

Do you use Google Play Services or is that a deGoogled Android 13?

Isnt that Chrome? Firefox shows an infinity sign past 100.