The Colorless Spirit summoned is not receiving the enchantment subtype it is supposed to. Here is a video of the bug in action.
It is not however, every time. Two out of the last 6 rounds, it has received the subtype, and the ensuing beginning of combat buff. Link to screenshot below.
In the video, the creatures also did not receive the +X/+X. The 3 tokens are created, and none of the rest happens.
Hello @Youzerfriendly,
Thank you for all the information provided, this issue will be investigated!
If you have any additional information that you consider relevant, please don’t hesitate to send me 
Rebeca.
Post began in Feb of '23, and I’m here to update that this is still an ongoing bug with Zur. Including some screen shots of today’s game matches using this creature and providing evidence that its still not giving its tokens the Enchantment subtype. And yes, Ugin vanguard makes identical tokens and I assure you the posted pics and battlelogs are indeed the token triggered from Zur and NOT Ugin vanguard.