pip-compile fails on the requirements list without blank lines, and doesn't fail when some blank lines are added

[yurivict]

pip-compile fails on this reqs.in file:
apsw
atomicwrites
attrs
Cerberus
coverage
deepdiff
dill
disjoint-set
distro
docopt
flake8
Flask
Flask-Cors
GPy
GPyOpt
graphviz
inspyred
intervaltree
Jinja2
junit2html
junitparser
lazy-loader
matplotlib
metric-learn
mplcursors
networkx
Nuitka
numpy
packaging
pandas
prettytable
psutil
pycryptodome
pymongo
pyrfr
pytest
pytest-cov
pytest-dependency
pytest-mock
pytest-timeout
pytest-xdist
python-ulid
PyYAML
pyzmq
scikit-learn
scipy
setproctitle
sobol-seq
statsmodels
tabulate2
termcolor
wrapt
xgboost-cpu

But pip-compile doesn't fail on this reqs.in which is only different in blank lines:
apsw
atomicwrites

attrs
Cerberus
coverage

deepdiff
dill
disjoint-set
distro
docopt

flake8
Flask
Flask-Cors
GPy
GPyOpt
graphviz
inspyred
intervaltree
Jinja2
junit2html
junitparser
lazy-loader
matplotlib
metric-learn
mplcursors
networkx
Nuitka
numpy
packaging
pandas
prettytable
psutil
pycryptodome
pymongo
pyrfr
pytest
pytest-cov
pytest-dependency
pytest-mock
pytest-timeout
pytest-xdist
python-ulid
PyYAML
pyzmq
scikit-learn
scipy
setproctitle
sobol-seq
statsmodels
tabulate2
termcolor
wrapt
xgboost-cpu

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Python-3.11
Linux