Global Styles: Switching styles takes a while on the frontend

[jasmussen]

Switching to an alternate style variation, inside the editor, is instant. Click one of the tiles and the visual is shown immediately:

If you then save the changes and preview the site frontend, however, the styles take a while to settle in. The following GIF shows changing a style, opening the frontend in a new tab, and then reloading the page over and over to see what takes:

Note that the typography and a few of the style changes are immediately shown. But things like background colors take a while, up to several minutes. Clearing the cache doesn't make any difference.

Steps to reproduce:

• Use a block theme, such as TT3 or TT2
• Go to the site editor
• Switch to a different style variation (Click global styles > Browse styles > Pick one). Save the changes.
• Click view > View site. Note that the new styles aren't applied immediately. Wait up to several minutes to reload. Eventually the whole style is applied.

Tested in Chrome on Mac.

[jasmussen]

Just to confirm, this is running latest trunk Gutenberg and TT3.

[Mamaduka]

Probably a duplicate of #43395, or the cause might be the same.

[jasmussen]

Excellent, thank you!

Closing in favor of #43395.

[jasmussen]

Reopening as this issue does appear to be separate from #43395 after all.