Problem is that if people don't report changes to TP to website the information are not updated.
I don't think there's anything to report about the transponders because there actually was no change.
The link you provide is about two other transponders with encrypted UHD channels. These channels were automatically picked up by my full scan, but of course tuning in to these result in a black screen because I do not have an access card and I'm not sure that Fransat cards would even work in a Vu+.
My issue was with non-encrypted HD channels in one single stream of a multistream transponder. So it does require some slightly exotic hardware (multistream) but it's free-to-air. Again: Stream 4 somehow required a manual scan this time but other streams on the transponder were found in the automatic full scan. As far as I can tell, the information in satellites.xml is correct for all streams (same info, except for stream ID), and the "missing" stream 4 was eventually found right where it always was expected to be.
How do you solved the problem manually?
As explained above:
I tuned in to a channel from another stream from this transponder, so that correct parameters would be pre-filled.
I then went to the menu for a Manual Scan, changed type to "User Defined", and changed "Stream ID" to "004" leaving all other parameters unchanged.
Launched scan: Missing/unseen channels were found instantly. Problem solved.
Everything is as defined in satellites.xml (frequency="12732000") and as listed by Lyngsat and KingOfSat, except that KingOfSat lists frequency as 12733.00 V while mu Vu+Ultimo reports 12732.368 MHz Vertical as real value in Service Info. @chafpa indicates 12731 above. All values in agreement within acceptable operational margins, I suppose.
This is the listing for this transponder from Lyngsat: