I have the same bug on one of my maps on a Vanilla / Spigot / Paper and Bukkit server in 1.14.4 and 1.15.1 and 1.15.2 with optifine or not and this for all players with and without plugins:
Proof:
Jeremylo1
I have the same bug on one of my maps on a Vanilla / Spigot / Paper and Bukkit server in 1.14.4 and 1.15.1 and 1.15.2 with optifine or not and this for all players with and without plugins:
Proof:
[media]