This can´t be normal! when PT reads plugin automation during playback it changes the "upload changes" arrow into green (e.g. something has changed). But it was only an automation read, not an auto-write.
It does not happen with track automation (vol, pan etc) only if you auto-enable a parameter of a plugin. Tried it with Air VIs Air plugins and Avid EQ7.
This is not the correct behaviour isn´t is? Makes no sense!