PowerShell: Get-Team unreliable / returning incomplete results

Here is an example script which proves the problem when obtaining all Teams. I've had results between 4454 and 4457, in a tenancy where no Teams are being created or deleted currently.

$LoopCount = 1
$Loops = 10
$WaitTimeSeconds = 400
do
{
    if($AllTeams) { $PreviousLoopData = $AllTeams }

    Write-Output "Get-Team Attempt $LoopCount | $(Get-Date -Format 'yyyy-MM-dd-HH-mm-ss')"
    try
    {
        $AllTeams = Get-Team -ErrorAction Stop
        Write-Output "Total Teams Found: $($AllTeams.Count)"

        if($PreviousLoopData)
        {
            $Diffs = Compare-Object -ReferenceObject $PreviousLoopData -DifferenceObject $AllTeams -Property MailNickName
            $NewButNotReally = $Diffs | Where-Object { $_.SideIndicator -eq '=>' } | Select-Object -Expand MailNickName
            if($NewButNotReally)
            {
                Write-Output "    - Comparison between previous loop and this loop suggests the following Teams have been CREATED: $($NewButNotReally -join ', ')"
            }
            $DeletedButNotReally = $Diffs | Where-Object { $_.SideIndicator -eq '<=' } | Select-Object -Expand MailNickName
            if($DeletedButNotReally)
            {
                Write-Output "    - Comparison between previous loop and this loop suggests the following Teams have been DELETED: $($DeletedButNotReally -join ', ')"
            }
        }
    }
    catch
    {
        $_
    }
    Start-Sleep -Seconds $WaitTimeSeconds
    $LoopCount++
} until ($LoopCount -ge 11)