Combining Non-capturing groups and alternation causes a panic

[Ryan1729]

If I enter in the following regex and subject then the capture list on the right doesn't update and the javascript console reports a panic:
Regex:

(?:a(b+)c)|(b+)d

Subject:

abc
bbd

This same regex and subject work as expected in the rust playground.

Either of (?:a(b+)c) or (b+)d work as expected in rustexp, and (?:a(b+)c)(b+)d even works too.