Custom theme in Fiori Query Browser makes crosstab disappear

[GSerfiotis]

Hello experts,

In Query Browser- having the default "bluecrystal" theme (Fiori wave 2)- I open a Query in the Design Studio (button: "open in Design Studio") and the cross tab appears properly and showing the data.

The problem lies when I apply to the FLP- the customer's Custom Theme , which I've created through the Theme Designer. I select the Query, and when I click on the button "open in Design Studio" no crosstab appears and no Data either. [Screen 1]
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I'm working on S/4 Hana 1610 on premise, embedded FES & BES scenario, SAP_UI751 SP02 (SAPK-75102INSAPUI), Theme Designer version 1.22.12, SAPUI5 version 1.44.8 .
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I already have:
- Cleared the caches
- Checked the Error Logs: /IWFND/ERROR_LOG, /IWBEP/ERROR_LOG which had no erroneous logs.
- Examined several KBA Notes, blogs etc - no existing info has helped..
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The following screenshots resembles the identical results both in Google Chrome and Mozilla:

Screen1: The crosstab and the data are missing:

Screen2: The Errors in Chrome's Console:

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I've been searched deeply but othing helped me resolve the issue.

Most relevant links below, didn't help as well:
1. https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=447464889#SupportforS4HANA[on-Premiseonly]-sap.zen.dsh.fioriwrapper
2. Note No.2417055 (not applicable)
https://launchpad.support.sap.com/#/notes/2417055 https://launchpad.support.sap.com/#/notes/2417055
3. https://archive.sap.com/discussions/thread/3422420
4. https://launchpad.support.sap.com/#/notes/2289865
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Thank you in advance,
Joanna