button_set display issue on WP v5.6

[STV11C]

Hi, it appears the button_set on the latest version on WordPress is showing an icon above the label. See screenshot attached.

I noted that the markup of the button_set is different on the latest WP 5.6 vs WP5.5x. e.g.
class="buttonset ui-buttonset ui-controlgroup ui-controlgroup-horizontal ui-helper-clearfix" (latest WP version)
vs
class="buttonset ui-buttonset" (old WP version)

Anyone else having this issue?

[dovy]

I am as well. WP core changed something internally. If you're willing to try and help find the issue I'd love that. I can't seem to pinpoint it...

[theme-x]

At my end, it's showing like the shot below