Is app with SPFx version 1.4.1 compatible with SharePoint Online?
I deployed SPFx app of version 1.4.1 and it has problem to sometimes load the web part and sometimes not, is it because of version compatibility?
SharePoint Stack Exchange is a question and answer site for SharePoint enthusiasts. It only takes a minute to sign up.Sign up to join this community
All features and all versions of SharePoint framework (SPFx) are supported by SharePoint Online.
Microsoft Documentation: SharePoint Framework development tools and libraries compatibility
You can also upgrade the SharePoint framework solution/project to the specified version (latest) for SharePoint online using CLI for Microsoft 365.
Check: spfx project upgrade