[Execute command failing]

Recently my server has been acting up concerning the execute command.

I tried simple checking for pigs named 1 with this command:

execute if entity @e[type=pig,name=1] placed a pig and gave it a tag with vanilla tags

It simply says "Test failed". I later tried on a survival world doing the exact same command  and it worked just fine. Furthermore, strangly it works fine if type it in chat on the server. However, once in a command block it just fails. It works if I check for entities in general.

Could it do with my sever being overloaded, a storage problem, (I have a fair amount of worlds etc)?

Not all execute commands fail. Some other random commands seem to not work as well.

HELP!

[Elytra boost]

Simply gives you a boost when you fly through a ring or designated area.

Here are some plugins that do such that I coudn't find currently:

https://www.spigotmc.org/resources/simple-elytra-rings.41265/

https://www.spigotmc.org/resources/elytraboost-rings-that-boost-elytra-players.41759/