The sign editing interface instantly closes if your block interaction range is set to a high value and you right click a far away sign.

Reproduction Steps:

1. Set your block interaction attribute value to a high value via a command such as 

   /attribute @s minecraft:generic.block_interaction_range base set 50

1. Place a sign down
2. Move far away (within the range) and right click the sign

You will see the interface instantly close.

Player <name> just tried to change non-editable sign

is logged for every right click when far away.