The following simple basic macro does not work anymore in LibreOffice 7.0:

Sub Test

Dim a(2) as Integer

a(0) = 10
a(1) = 20
a(2) = 30

For Each n In a()
  msgbox n
Next n

End Sub

The macro should successively display the numbers 10, 20 and 30. Instead, an error message is given (at first iteration):

'Inadmissible value or data type. Data type mismatch.'

The macro works as expected in LibreOffice 6.4.5.2.

Tested in Ubuntu 20.04.1 LTS, LibreOffice 7.0.0.3 obtained from www.libreoffice.org.

100% reproducible.

Please note that this problem breaks the TexMaths extension (on Linux and Windows systems).