Just wanted to let you know that the immigration in Krabi requires that you register again after every stay outside the house, e. g. an overnight in Phuket. So TM30 not only after leaving the country.
TLDR : Answer Summary
In Krabi, the immigration office mandates that residents must register again using the TM30 form after each overnight stay outside their primary residence, such as a trip to Phuket. This means that TM30 registration is required not just when leaving the country, but also for short domestic trips.