Actually the two errors are:
...
t/50-mech-new-tab.t ........................... 7/8 Could not find nod
+e with given id
-32000 at C:\Users\PUGRAN~1\.cpanm\work\1609769637.8608\WWW-Mechanize-
+Chrome-0.65\blib\lib/Chrome/DevToolsProtocol/Target.pm line 490
# Looks like your test exited with 2304 just after 7.
t/50-mech-new-tab.t ........................... Dubious, test returned
+ 255 (wstat 65280, 0xff00)
Failed 1/8 subtests
...
t/60-mech-custom-headers.t .................... 4/21 No search session
+ with given id found
-32000 at C:\Users\PUGRAN~1\.cpanm\work\1609769637.8608\WWW-Mechanize-
+Chrome-0.65\blib\lib/Chrome/DevToolsProtocol/Target.pm line 490
# Looks like your test exited with 2304 just after 10.
t/60-mech-custom-headers.t .................... Dubious, test returned
+ 255 (wstat 65280, 0xff00)
Failed 11/21 subtests
These errors are "safe" to ignore, as they are some timing related issue which I haven't found the cause of (or a solution for) yet.