Multiline fixed string search failing when a newline character is followed by the ^ character about ripgrep HOT 10 CLOSED

$ echo 'fig
^mango'
fig
!!:s^mango

$ printf '%b' "$s" | rg --trace -UF 'fig
^mango'
DEBUG|rg::flags::config|crates/core/flags/config.rs:41: /home/andrew/.ripgreprc: arguments loaded from config file: ["--max-columns-preview", "--colors=match:bg:0xff,0x7f,0x00", "--colors=match:fg:white", "--colors=line:none", "--colors=line:fg:magenta", "--colors=path:fg:green", "--type-add=got:*_test.go"]
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1099: using heuristics to determine whether to read from stdin or search ./ (is_readable_stdin=true, stdin_consumed=false, mode=Search(Standard))
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1112: heuristic chose to search stdin
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1260: found hostname for hyperlink configuration: duff
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1270: hyperlink format: ""
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:174: using 1 thread(s)
DEBUG|grep_regex::config|crates/regex/src/config.rs:175: assembling HIR from 1 fixed string literals
TRACE|grep_regex::matcher|crates/regex/src/matcher.rs:66: final regex: "(?:fig\n\\^mango)"
TRACE|grep_regex::literal|crates/regex/src/literal.rs:59: skipping inner literal extraction, no line terminator is set
DEBUG|globset|crates/globset/src/lib.rs:453: built glob set; 0 literals, 0 basenames, 12 extensions, 0 prefixes, 0 suffixes, 0 required extensions, 0 regexes
TRACE|rg::search|crates/core/search.rs:254: <stdin>: binary detection: BinaryDetection(Convert(0))
TRACE|grep_searcher::searcher|crates/searcher/src/searcher/mod.rs:728: generic reader: reading everything to heap for multiline
TRACE|grep_searcher::searcher|crates/searcher/src/searcher/mod.rs:732: generic reader: searching via multiline strategy
apple fig
^mango banana

[andrew@duff ripgrep] printf '%b' "$s" | rg --trace -UF 'fig
^mango'
DEBUG|rg::flags::config|crates/core/flags/config.rs:41: /home/andrew/.ripgreprc: arguments loaded from config file: ["--max-columns-preview", "--colors=match:bg:0xff,0x7f,0x00", "--colors=match:fg:white", "--colors=line:none", "--colors=line:fg:magenta", "--colors=path:fg:green", "--type-add=got:*_test.go"]
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1099: using heuristics to determine whether to read from stdin or search ./ (is_readable_stdin=true, stdin_consumed=false, mode=Search(Standard))
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1112: heuristic chose to search stdin
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1260: found hostname for hyperlink configuration: duff
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:1270: hyperlink format: ""
DEBUG|rg::flags::hiargs|crates/core/flags/hiargs.rs:174: using 1 thread(s)
DEBUG|grep_regex::config|crates/regex/src/config.rs:175: assembling HIR from 1 fixed string literals
TRACE|grep_regex::matcher|crates/regex/src/matcher.rs:66: final regex: "(?:fig\n!!:s\\^mango)"
TRACE|grep_regex::literal|crates/regex/src/literal.rs:59: skipping inner literal extraction, no line terminator is set
DEBUG|globset|crates/globset/src/lib.rs:453: built glob set; 0 literals, 0 basenames, 12 extensions, 0 prefixes, 0 suffixes, 0 required extensions, 0 regexes
TRACE|rg::search|crates/core/search.rs:254: <stdin>: binary detection: BinaryDetection(Convert(0))
TRACE|grep_searcher::searcher|crates/searcher/src/searcher/mod.rs:728: generic reader: reading everything to heap for multiline
TRACE|grep_searcher::searcher|crates/searcher/src/searcher/mod.rs:732: generic reader: searching via multiline strategy

$ s='apple fig\n^mango banana\n123 456\ndragon$\nunicorn\n'
$ printf '%b' "$s" | rg -UF 'banana
123'
^mango banana
123 456
$ printf '%b' "$s" | rg -UF 'fig
^mango'
apple fig
^mango banana