BMC Support is asking me what field type these fields are. Since they are "internal" fields, I cannot see their configuration.
It seems to me I just need a script correcting the "Internal" fields.
I've seen issues related to the color field.. years ago.. I dont recall specifically the issue, or whether it was fixed or not.
What version are you testing, and what is the situation with the template.
Going from 12.1.05 to 12.19.02.
The 12.19.02 instance is a clone of the previous, then updated.
Trying to apply a template from either in 12.19.02 instance results in the error and no workspace is created/updated.
Have the same with the field "Icon Name"?