Using

placeholderapi: true
placeholderapi-placeholders:
  allowflight: "%player_allow_flight%"
  god: "%luckperms_check_permission_essentials.god.others%"

in extracontext causes server to crash whenever luckperm tries to calculate player.
allowflight works and does not produce this bug.

Version: 1.16
LP: 5.1.26

https://pastebin.com/NLZ8z1iY

Have you installed the luckperms papi cloud extension? see: https://github.com/lucko/LuckPerms/wiki/Placeholders

Also what's the output of /papi parse USER %luckperms_check_permission_essentials.god.others%

Of course I did install the extension.
And parsing outputs yes/no accordingly to the user.
Only issue happens when I add placeholder to the extracontext. I can provide more information whether other plugins affect this bug and for what placeholders it happens later this day.

You cannot use LuckPerms placeholders or placeholders which query permissions in the PAPI extracontexts section.

The latest version of EssentialsX adds a dedicated placeholder for god mode anyway btw:)