UPDATE 3/13:
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Version 2403 (Build 17425.20008)
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Microsoft 365 Insider Current Channel v2403 build 17425.20058 - March 13
Microsoft 365 Insider: Version 2403 (Build 17425.20058) Various bug and performance fixes. Source: Release Notes Current Channel (Preview) - Office release notes Update History for Office Current Channel (Preview) - Office release notes...

Microsoft 365 Insider:
Version 2403 (Build 17425.20008)
Resolved issues
Excel
- We fixed an issue where attempting to programmatically set the Formula property on a Linked Picture resulted in a run-time error.
- We fixed an issue that caused errors when attempting to save files in environments where Default Labeling and Mandatory Labeling policies are configured and AIP document co-authoring is disabled.
- We fixed an issue where the input language of a keyboard converted from Chinese Traditional to English, an error appeared, and the app closed unexpectedly when the name of an Excel sheet was edited.
OneNote
- We fixed an issue where, after switching from an ODM notebook to an ODP notebook with the notebooks pane pinned, the Math Assistant continued to appear in the Draw tab and prompted an error.
Outlook
- We fixed an issue where the App Search bar was unexpectedly appearing above the message list in Outlook 2016 and Outlook 2019.
- We fixed an issue with user and shared mailboxes where a message sent from a user with saved to Sent Items folder enabled and where DelegateSentItemsStyle is set to 1 is saved in the shared mailbox Sent Items folder.
- We fixed an issue where Office add-ins disappeared from the ribbon.
- We fixed an issue that affected all-day meetings with a reminder on the day of. The meeting did not open, and an error message was displayed.
PowerPoint
- We fixed an issue where PowerPoint closed unexpectedly when a user tried to open a copy of a presentation saved to the cloud.
- We fixed an issue where PowerPoint (.pptx) files exported as .pdf truncated or omitted images.
Project
- We fixed a performance issue with opening a Project MPP file with a high percentage difference in file size by shortening the interval of file compaction.
- We fixed an issue in projects saved to SharePoint document libraries where, on Save, a user's changes remained in their local cache after the file check in was complete. If the file was then immediately checked out, updated, and checked back in by a different user, the first user experienced possible data loss.
Word
- We fixed an issue where certain Word documents would not open in compatibility mode.
- We fixed an issue where completing Proofing with an Office Add-in's side pane open would result in the add-in's pane being closed.
- We fixed an issue where characters became invisible when converted to Kanji.
- We fixed an issue where styles changed or were applied incorrectly when transitioning to WPM.
- We fixed an issue where pasting a list with a custom style into a document that was saved to the cloud with restricted formatting would show an "AutoSave Failed" error.
Office Suite
- We fixed an issue where opened Office apps did not automatically start when a laptop was reopened, and an error message appeared after manual relaunch.
- We fixed an issue where the app wouldn't re-install when the device was offline, and the re-install was from a local install source.
- We fixed an issue where a mandatory sensitivity label was not applied or prompted for if an email was sent from the Drafts-folder.
- We fixed an issue where the user was notified of an Alt-text violation after adding and deleting an image.
Source:
- Release Notes Current Channel (Preview) - Office release notes
- Update History for Office Current Channel (Preview) - Office release notes

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