How to create a template from a SharePoint list that has multiple column types?

Hi @Vanessa,

I'm afraid no fix to this issue. As said in this article: Error when you save a list or library as a template in SharePoint Online, "You browse to the settings for the list or library in order to save it as a template, and then you select the option to Include Content." may cause this issue.

As a workaround, I suggest you give a try to save list as template using PnP PowerShell:

#Parameters
$SiteURL= "https://xxx.sharepoint.com/sites/xxx" 
$ListName = "xxx"
$TemplateFileName = "ListTemplate.stp"
$TemplateName = "ListTemplate"
$TemplateDescription=""
$IncludeData = $True
  
#Connect to PnP Online
Connect-PnPOnline -Url $SiteURL -Credentials (Get-credential)
$Context  = Get-PnPContext
 
#Get the List
$List = Get-PnpList -Identity $ListName
 
#Save List as template
$List.SaveAsTemplate($TemplateFileName, $TemplateName, $TemplateDescription, $IncludeData)
$Context.ExecuteQuery() 

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