Thanks for quick repair, Luigi. Integral symbol in several fonts goes normal in Version 1.22.0, however, a new problem arises.
With unicode-math, both upper and lower limits of definite integral are placed far from the integral symbol, even using the default Latin Modern. Without unicode-math, Latin Modern looks good, but NewCM does not (same as unicode-math case). Sample codes are: %-- with unicode-math \documentclass[fleqn]{article} \usepackage{unicode-math} \begin{document} With unicode-math \[ \int_a^b f(x)\,dx\quad\textrm{LM} \] \setmathfont{NewComputerModern Math} \[ \int_a^b f(x)\,dx\quad\textrm{NCM} \] \setmathfont{STIX Two Math} \[ \int_a^b f(x)\,dx\quad\textrm{STIX2} \] \end{document} %-- without unicode-math, LM \documentclass[fleqn]{article} \begin{document} Without unicode-math \[ \int_a^b f(x)\,dx\quad\textrm{LM} \] \end{document} %-- without unicode-math, NCM \documentclass[fleqn]{article} \usepackage{newcomputermodern} \begin{document} Without unicode-math \[ \int_a^b f(x)\,dx\quad\textrm{NCM} \] \end{document} -- ._._. Cosy MUTO ..._._