Command Block sometimes doesn't save command after clicking "Done" when there is server lag

20w21a Server, with ~200 command blocks (All in spawn chunks), Server was lagging at the time.

When clicking the "Done" option with any command tested entered, command did not save even if there was a command set before. Events leading up to that point:

used /kill @s ~500 blocks away from spawn chunks. Respawned (with some lag from respawning from several chunks away) and opened the command block. The command previously in the command block was "/execute at @a[scores={poison=1}] at @e[type=!Minecraft:player,scores={poison=0},distance=5] run effect give @e [type=!Minecraft:player,scores={poison=0},distance=5] Minecraft:poison 5 0 true" was no longer in the command block. Upon entering, and clicking "done" again, and entering the command block, the command was gone again. Also tried /tp @p ~ ~5 ~ and /clear @p, both not staying set in the command block.