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This is behaving as intended, blocks shown in the 'blocks' node do not have any PCB context, they just show the logical design. When you place a block into a board it will show the Reference Designators as they exist in the PCB. It behaves like this as you can have multiple copies of a single block within the PCB, each having it's own 'context' and unique references.
Thank you, robert_davies.
When I export PDF, all of Boards schematics and Blocks schematics are exported, but I only need Boards schematics that have PCB context, so how to skip the Blocks section, thanks.
Set the Export context to Block and use the top level block of the Board.