In 8.5.2.3 Derivation process for spatial merging candidates, the pruning is:

• candidate B1 is pruned with A1
• candidate B0 is pruned with B1, A1
• candidate A0 is pruned with A1, B1, B0
• candidate B2 is pruned with A1, B1, B0, A0

But JVET-L0093 reduces it to:

• candidate B1 is pruned with A1
• candidate B0 is pruned with B1, A1
• candidate A0 is pruned with A1, B1, B0
• candidate B2 is pruned with A1, B1, B0, A0

The corresponding lines of the spec should be removed as, for example with candidate A0:

– The variables availableFlagA0, refIdxLXA0, predFlagLXA0 and mvLXA0 are derived as follows:

– If one or more of the following conditions are true, availableFlagA0 is set equal to 0, both components of mvLXA0 are set equal to 0, refIdxLXA0 is set equal to −1 and predFlagLXA0 is set equal to 0, with X being 0 or 1, and bcwIdxA0 is set equal to 0:

– availableA0 is equal to FALSE. – availableA1 is equal to TRUE and the luma locations (xNbA1, yNbA1) and (xNbA0, yNbA0) have the same motion vectors and the same reference indices. – availableB1 is equal to TRUE, the luma locations (xNbB1, yNbB1) and (xNbA0, yNbA0) have the same motion vectors and the same reference indices and MergeTriangleFlag[xCb][yCb] is equal to 1. – availableB0 is equal to TRUE, the luma locations (xNbB0, yNbB0) and (xNbA0, yNbA0) have the same motion vectors and the same reference indices and MergeTriangleFlag[xCb][yCb] is equal to 1.

As far as I understand from the specification text in 8.5.2.2 Derivation process for luma motion vectors for merge mode, a merge candidate consists in the following information: refIdxL0, refIdxL1, predFlagL0, predFlagL1, mvL0, mvL1, hpelIfIdx and bcwIdx. But it seems that the half sample interpolation filter index hpelIfIdx is never set for Hmvp candidates. According to 8.5.2.16 Updating process for the history-based motion vector predictor candidate list, a candidate in the HMVP list of candidates is defined as: "The MVP candidate hMvpCand consists of the luma motion vectors mvL0 and mvL1, the reference indices refIdxL0 and refIdxL1, the prediction list utilization flags predFlagL0 and predFlagL1, and the bi-prediction weight index bcwIdx." There is no information about the half sample interpolation filter index. Please check!

partition_constraint_override_flag in the picture header is currently signalled using ue(v). It should be changed to u(1).