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UPDATE: Issue fixed with new json theme. However, @mattlee there is a problem with the button fill. The fill doesn't actually fill the whole of the last button and is a visual glitch. See the screenshot below. Any idea if this will be fixed?
This is a new issue in the service recently introduced. I have a new button slicer with the selected state of the callout values configured to have a different font colour. This works fine in Desktop but is ignored in the Service. Previously, this was working fine.
Update for repro steps:
In Desktop:
In Service (colours not applied and also note the thin grey bar to the right of the last button which also should not be there):
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A second issue related to conditional formatting rules for New Slicer (Preview) with May Desktop has been identified, we plan to QFE Desktop within a few days so you can continue to author new format rules for Button and List Slicer in the May release. Existing saved rules are fine. This issue is not related to custom themes. If you save a file with conditional format rules for New Button or List slicer, you may encounter a silent upgrader error, which will cause the formatting to be lost the next time you open the file. The Desktop QFE will fix this for May soon, but Edit/Save in the web will take longer to be patched.