Ties in imported (2.x) tablature have wrong horizontal placement: fixed by saving and reloading
P2 - Medium
S3 - Major
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.0.0, revision: 26ad655
See attached score. Note the position of ties in measures 3 and 9 of the tablature. They have shifted horizontally compared to the correct alignment in MS 2.3.