You can revert to previous behavior in the short term by following the steps below to enable compatibility mode:
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In the search box on the taskbar, type Settings, and then either select it in the list of results or select Enter.
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Type IME settings into the search box within Settings and select the IME settings that are appropriate to your language—for example Japanese IME Settings.
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Select General.
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Turn on Use previous version of Microsoft IME.
Note: We do not recommend using the compatibility setting for the long term, but rather as a temporary workaround for users who are impacted by this issue.