Hello Raphaël Jakse ,
I try to make a example:
Working:
<ac:structured-macro ac:name="mathblock" ac:schema-version="1" ac:macro-id="0867c2f9-9fa0-4b0a-b932-48e5f9d14981"><ac:plain-text-body><![CDATA[\begin{align} a^2 + b^2 &= c^2 \tag{4.1} \\ c &= \sqrt{a^2 + b^2} \tag{4.2} \end{align}]]> </ac:plain-text-body></ac:structured-macro>
None Working:
<p><ac:structured-macro ac:name="mathblock" ac:schema-version="1" ac:macro-id="c91a7dbb-6cbc-4202-abca-73498b7e94ee"><ac:plain-text-body><![CDATA[a^2 + b^2 = c^2 \tag{1}]]></ac:plain-text-body></ac:structured-macro></p