If you intend to use the simplex TX/RX channels as duplex channels in future, you need to assign the preserve unused channel QSF to the unused RX/TX channel.
Device Family: Intel® Stratix® 10 GX, Intel® Stratix® 10 MX, Intel® Stratix® 10 SX, Intel® Stratix® 10 TX
Intel Software: Quartus Prime Pro
Type: Errata
Area: HSIO
Version Found: v19.2
Bug ID: 14010227986