Just for the record - Season 6 is currently ordered incorrectly after fernsehserien.de ( https://www.fernsehserien.de/disneys-gummibaerenbande/episodenguide/staffel-6/4428 ). After some research I'm going to correct episode order of season 6 after english wikipedia ( https://en.wikipedia.org/wiki/List_of_Disney%27s_Adventures_of_the_Gummi_Bears_episodes#Season_1:_1985 ) which seems to be most comprehensive source for this serie.

Regarding season 6 in particular:

"Season 6 premiered as part of The Disney Afternoon. The order and airdates presented here correspond to the first airings of the new episodes on TDA.[1] Three of these were 11-minute episodes, "Friar Tum", "Zummi in Slumberland", and "A Recipe for Trouble", which each aired in the U.S. coupled with a segment from a previous season; here, each of them is listed by itself. However, in international markets, season 6 was presented in a different order than in the U.S.,[2] and these segments were grouped together into two half-hours (with "Friar Tum" being coupled with the leftover season 5 segment "Never Give a Gummi an Even Break"). This is why some episode guides list "Friar Tum/Never Give a Gummi an Even Break" and "Zummi in Slumberland/A Recipe for Trouble", which is how the episodes were presented internationally. (Also, though most consider the two-part "King Igthorn" story to be the series finale, and it comes last in the international episode order, six more episodes premiered after it in the U.S., over a two-week period in February 1991.)"

So contrary to thetvdb, I'm going to put episode "Never Give a Gummi an Even Break" at the end of season 5.