v0.21.1 and onwards changed how this was indented.
* lisp/progmodes/go-ts-mode.el (go-ts-mode--indent-rules):
Add rule for var_spec_list.
(cherry picked from commit
7f76f872ebfd67fb52974426c47bf3d08724d716)
((parent-is "type_spec") parent-bol go-ts-mode-indent-offset)
((parent-is "type_switch_statement") parent-bol 0)
((parent-is "var_declaration") parent-bol go-ts-mode-indent-offset)
+ ((parent-is "var_spec_list") parent-bol go-ts-mode-indent-offset)
(no-node parent-bol 0)))
"Tree-sitter indent rules for `go-ts-mode'.")