5.10 APAC - Activities uploading to Garmin Connect with incorrect time

Since updating to 5.10, I notice that activities using GPS that are uploaded to Garmin Connect are being uploaded as having occurred at GMT -05:00 Eastern Time (US & Canada).

However, I am in Japan. Garmin Connect and my iPhone are of course set to Japan time.

Activities uploaded prior to updating to 5.10 were uploaded with the correct time (GMP +09:00 Japan Standard Time).

Anyone else seen this?