SAP MM, Material Ledger, post New G/L migration issue with J* reports

Suppose New G/L migration is happening in FY 2020, and ,out of the blue, J1GGL report stops displaying data for the specified ledger(s) for G/L accounts, which is linked to GLT0 table update post New G/L migration.
When asking SAP, they might advise you to take a look at the following SAP note # 923946 with some correction instructions provided in it, which ,in fact, is not solving the issue with J* reports. Programs that can be affected are as following:
J_1GALTB Ledger Trial Balance (Official)
J_1GALTL Update A/L (FI) from SPL
J_1GGL000 Detailed Ledger
J_1GJR_ROUTINES Document Journal
J_1GSL000 Summarized Ledger
J_1GTBAC0 Ledger Trial Balance in ASCII file
J_1GTBGL0 Ledger Trial Balance (Unofficial)
J_1GVL_ALPOST_DI Analytical Ledger (A/L) postings for Materials
J_1GVL_WHBT05 Read actual values for given WHB column

In reality workaround to the issue is as simple as below:

(1) Execute J1GGL for ALL of the the prior to FY 2020 fiscal years (i.e. all of the FYs prior to New G/L migration). I believe, some FM is being re-generated at this step. If you know FM technicalities, then just re-generating it via SE37 should be enough (and share FM naming in comments section!:))

(2) Execute J1GGL for the FY 2020 and validate whether now data is being displayed correctly.