I couldn't find any info what the Hifiberry folks changed between rev 2.1 and 2.2 but I found a post where a user got his Digi+ pro working with a slight hardware modification - something similar might work with the Digi2 Pro as well:
https://support.hifiberry.com/hc/en-us/community/posts/15842018863261/comments/16381227323677
From the looks of it Hifiberry messed up their hardware design and I'm wondering why they didn't wire up the WM8804 reset to a GPIO pin like outlined in the reference design in the WM8804 datasheet, this likely would have avoided the powerup issues.
The Linux driver supports this and the Allo DigiOne and the Cirrus WM5102 dtoverlays use this, just not the Hifiberry and other WM8804 based SPDIF soundcards.
so long,
Hias