PDF generation API error on recent DOCX

Hello, 
I use the PDF generation API to send docx template + array to retrieve pdf. All was working fine since end of March.
A working docx template will no longer work if i save it again (like add space + remove + save).
the problem occurs only when converting in pdf: template docx to docx seem working fine.

'cpf:inline' => [
                        'outputFormat'     => 'pdf',
                        'jsonDataForMerge' => ['toto' => 'toto'],
                    ],

outputFormat as PDF trigger the error.

here is the UNSUPPORTED_OR_CORRUPTED_TEMPLATE error : 

\"cpf:status\":{\"completed\":true,\"type\":\"\",\"title\":\"Either unsupported or corrupted file content provided. The only supported format is docx; transactionId=XpY0r4AgreDVkynOlMAPp60Qau7COeTL\",\"status\":400,\"report\":\"{\\\"error_code\\\":\\\"UNSUPPORTED_OR_CORRUPTED_TEMPLATE\\\",\\\"source\\\":\\\"docgen_engine\\\"}\"}

It seems there is may be a conflict with the Microsoft Word update and Adobe API service ?
You can reproduce event with an empty template