We migrated from magento-1.9.2.4 to magento-2.3.2 without problems so far. After upgrading to magento-2.3.3 (using composer) the tax configuration (Sotres -> Configuration -> Sales -> Tax) page only shows a white screen.
Therefore we tested to migrate from magento-1.9.2.4 directly to magento-2.3.3 - same outcome.
Sadly there is no error shown in the system.log or any info in the debug.log. No exception.log or reports were created.
We truncated all tax_*-tables - still same outcome. we remove all %tax% entries from core_config_data table - still same outcome.
Cache is disabled.
Source code of blank page:
<style>
.highlighted {
background-color: #DFF7FF!important;
}
</style>
<form action="http://10.0.0.12:8000/magento2/2.3.2/382t9egh/admin/system_config/save/key/f9315ea2f5be58a51fd9aa811d3511d684705a4260a366d5c0854759124fdf24/section/tax/" method="post" id="config-edit-form"
enctype="multipart/form-data">
<div><input name="form_key" type="hidden" value="c2Q2qjPKd7aIDSZK" /></div>
<div class="accordion">
<div class="entry-edit form-inline">
That's all we got.
Any idea what causes the problem?
If not: any idea how to investigate or start proper testing?