mjevans
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This issue occurred on a server I'm playing on.
An ALTERNATE WORKAROUND is to properly use a Potion of Invisibility (maybe more than one) and visit the nether with all armor and weapons removed (in fact I went in with just food and torches).
Make sure you don't bump against the mobs. Maybe hide in a corner or crybox until the potion runs out. Since the mobs can't see any players but are loaded the timer will actually expire.
After speaking with one of the operators on a server I play on that recently got upgraded from 1.14.2 (world generated and played only in this version) directly to 1.14.4 (probably with no upgrade commands run?), I believe we too are experiencing this issue.
I've asked the operators of the server to please look at this ticket and implicitly to provide the /debug report and other information as requested.
We confirm that there are practically no mobs respawning in locations such as ocean monuments/temples, and that there are disturbingly few natural spawns in untouched caves. (The operator was able to use spectator mode at spawn where I'd been waiting for a bit to see if there were too many mobs there.)