Zombies, Creepers and Spiders spawning in the nether

sorry, unable to reproduce

Please attach a screenshot of this occurring while the F3 debug screen is enabled.

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I had it happen at y 253 above the nether roof, zombies spawned on netherack which I had placed. Left and joined server, unloaded and reloaded the server, still happened. Since i was on hard mode when one got on low health loads more spawned. Two things I should also mention I was building a shared aggresion zombie piglin farm when it started happening and i was using an Aternos server. Only mods on were do a barrel roll(elytra movement) and sodium, both client-side. I hope it gets patched since I've had 5 of them spawn at once and that results in an average efficiency drop of 7% in the gold farm(since it lowers the mob cap for zombie piglins to fill by 7%). No spiders and creepers though

@Number_Fan
The zombies are from MC-14800. Moreover, modded game isn't allowed in this site.

Please attach a screenshot of this occurring while the F3 debug screen is enabled.

_{This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.}

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki