If a primary and secondary read are initiated from the PLB and the AXI response is out of order, either a DECERR or SLVERR occurs on the AXI bus for the secondary read.
This secondary read is returned first and gets saved in the read FIFO.
The error does not get logged.
Also, there is a documentation error in (DS711):
To work around this issue, edit the axi_master_burst_rd_thrds.vhd:
There are no plans to fix these issues.