When importing an SDK by selecting "Import folder...", and cancelling the importing while it is in progress, the origin folder will be deleted.
Tested on a virtual machine Linux Mint. MCUXpresso IDE v11.6.0 [Build 8187]. Also saw it on MCUXpresso IDE v11.5.1 [Build 7266].
Thanks for the information, please help me to report it internally (Jira ticket)
Regards