This has been discovered in MDL-59298 where rezaie9 used the following AMOScript in the commit message:

AMOS BEGIN

 CPY [emailpasswordchangeinfosubject,core],[emailpasswordchangeinfosubject,auth_oauth2]

AMOS END

for which the cibot raised an error "AMOS - Instruction not understood"

It turned out to be a bug in AMOS' mlanglib and its copy in the local_ci plugin. It does not like the "2" digit character in the auth_oauth2 component, regardless it is a valid PARAM_COMPONENT value.

We need to fix both AMOS and local_ci.