WoW: Go straight up into M+? Then avoid the “old” dungeons
A bug in WoW: Dragonflight is currently causing the four older dungeons in the Mythic Plus Season 1 dungeon pool to ignore an important keystone award mechanic.
Season 1 of WoW: Dragonflight has started and with it the run on the Mythic Plus dungeons has begun. If you complete a normal mythical dungeon, you will automatically receive a level 2 keystone at the end of the dungeon and can then continue to level it up. Players already know this system from previous expansions. Anyone who joins a group in their first run that has already completed higher levels of difficulty will be given a higher key depending on the level of difficulty.
At the beginning of the first Dragonflight season, it may be advisable not finish one of the four “old” dungeons first. In the Season 1 M+ dungeon pool are the instances Court of Stars, Shadowmoon Burial Grounds, Temple of the Jade Serpent and Halls of Valor. A bug currently means that the difficulty level of these old dungeons is not taken into account when assigning your very first keystone in the season – you always get a +2 key.
Choose a Dragonflight dungeon as the first high keystone
If you want to play lower keystones anyway, you won’t be affected so much by this bug. However, this will especially slow down those who plan to high-key several characters this week and try to level up their keystone themselves as effectively as possible.
If you want to have a keystone in your pocket that is higher than +2 right away, join a guild group that owns a higher keystone of a Dragonflight dungeon and do not play one of the four listed instances from the old expansions first. Alternatively, you level up a keystone with the twink and join the group with your main character from a certain keystone level (which is a Dragonflight dungeon).
Source | WoWHead
Reference-www.buffed.de