Does anyone know what the expected behavior is in the mapped enrollment when you increase seat size

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We have been trying to determine if something has changed recently in the expected behavor when edits are made to increase seats. I have looked for documentation in the the LearnCenter Help but didn't find anything.

Some of our team has thought that editing an session that former had 20 seats to 30 seats would automatically undate the enrollment. Some thought that only held true for the original creation of the enrollment; if you edited the session to 30 seats...you also had to go to the enrollment to make the increase.