lyx2lyx problem with master export to 2.3.x

[Scott Kostyshak]

I get the following when exporting the English User Guide to 2.3.x from
master and opening with LyX 2.3.x. I do not get any terminal output when
opening in master (i.e., I do not see a problem with roundtrip).

  $ lyx-master -e lyx23x UserGuide.lyx 
  $ lyx-23x UserGuide.23.lyx 
  Lexer.cpp (932): Missing 'wide'-tag in InsetFloatParams::read. Got alignment instead. Line: 23656
  LyX: Bad boolean `alignment'. Use "false" or "true" [around line 23656 of file ~/lyxbuilds/master/repo/lib/doc/UserGuide.23.lyx current token: 'alignment' context: 'InsetFloatParams::read']
  Lexer.cpp (932): Missing 'sideways'-tag in InsetFloatParams::read. Got document instead. Line: 23657
  LyX: Bad boolean `document'. Use "false" or "true" [around line 23657 of file ~/lyxbuilds/master/repo/lib/doc/UserGuide.23.lyx current token: 'document' context: 'InsetFloatParams::read']
  Lexer.cpp (932): Missing 'status'-tag in InsetCollapsible::read. Got wide instead. Line: 23657
  Text.cpp (1882): Handling unknown body token: `false'
  Text.cpp (1882): Handling unknown body token: `sideways false'
  Text.cpp (1882): Handling unknown body token: `status collapsed'
  Lexer.cpp (932): Missing 'wide'-tag in InsetFloatParams::read. Got alignment instead. Line: 23698
  LyX: Bad boolean `alignment'. Use "false" or "true" [around line 23698 of file ~/lyxbuilds/master/repo/lib/doc/UserGuide.23.lyx current token: 'alignment' context: 'InsetFloatParams::read']
  Lexer.cpp (932): Missing 'sideways'-tag in InsetFloatParams::read. Got document instead. Line: 23699
  LyX: Bad boolean `document'. Use "false" or "true" [around line 23699 of file ~/lyxbuilds/master/repo/lib/doc/UserGuide.23.lyx current token: 'document' context: 'InsetFloatParams::read']
  Lexer.cpp (932): Missing 'status'-tag in InsetCollapsible::read. Got wide instead. Line: 23699
  Text.cpp (1882): Handling unknown body token: `false'
  Text.cpp (1882): Handling unknown body token: `sideways false'
  Text.cpp (1882): Handling unknown body token: `status collapsed'
  $

Scott
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