4134682ec2
Caused by 6b8cdd5979.
Above commit introduced element tagging for boundary calculations but
only cleared them properly on all faces if the new `Preserve Seams`
option was chosen. We cannot be sure about the state of element tags
from prior operators though, so correct the culprit check to also only
be in effect if the new `Preserve Seams` option was chosen.
Pull Request: https://projects.blender.org/blender/blender/pulls/107161
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