Congratulations, you are the first one to find the reason, why I demoted the version from "final" to Beta 4 only. I was surprised, that a good 2 weeks since the release of beta 4, nobody else complained about this yet. When I found it first, I gave it the same name btw; in my "outstanding work" list, it runs under the "rudolph"-bug.
Unfortunately, this bug is very difficult to analyse and fix, which is why I left it in for the beta 4. I tested beta 4 on 9 (!) different platforms ((Win/Mac/Lin) X (XP9, XP10 32 bit, XP10 64 bit)), and it only occured on one so far, and it does not occur in a repeatable fashion either.
We do not even know if it is our plugin causing this, the "external lights object" that we added for beta 4 or the aircraft file itself. And due to the lack of repeatability of this bug, it is very hard to pinpoint the culprit. (I can try the exactly same configuration 5 times and I get the bug only 2 times out of the 5)
You can help us by giving us details of your computer configuration (OS, exact X-plane version, time of day when this occured and position of all the external light switches at time of occurence.)
Fortunately, this bug is really a simple nuisance that does not inhibit you from flying; so while we are working on it, it is not something that needs solving by tomorrow.
Thanks for pointing this out,